//  Copyright (c) 2020 Cisco and/or its affiliates.
//
//  Licensed under the Apache License, Version 2.0 (the "License");
//  you may not use this file except in compliance with the License.
//  You may obtain a copy of the License at:
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
//  Unless required by applicable law or agreed to in writing, software
//  distributed under the License is distributed on an "AS IS" BASIS,
//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//  See the License for the specific language governing permissions and
//  limitations under the License.

//go:build !cgo

package graphviz

import (
	"bytes"
	"fmt"
	"os/exec"
)

// TODO: add fallback that uses online tool: https://dreampuf.github.io/GraphvizOnline/

func RenderFilename(outfname, format string, dot []byte) error {
	cmd := exec.Command("dot", fmt.Sprintf("-T%s", format), "-o", outfname)
	cmd.Stdin = bytes.NewReader(dot)
	if _, err := cmd.Output(); err != nil {
		return err
	}

	return nil
}

func RenderDot(dot []byte) ([]byte, error) {
	cmd := exec.Command("dot", "-Tdot")
	cmd.Stdin = bytes.NewReader(dot)
	out, err := cmd.Output()
	if err != nil {
		return out, err
	}

	return out, nil
}
